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Be sure to look at it in HD which I think heightens the audio quality too.

I think the Casio does OK, it sounds if anything more "from a box" than the grand. And then the keyboard sounds more - which Casio (I think) (see rep comment below) blaims on a different closer mic setup - which I think partly destroys the comparos neutrality. But still interesting!

I think that's quite an easy task for most digital pianos. They even did something like that with the very first sampled piano ever made - the Kurzweil 250. The sound is distant, and laced with reverb.

I think it's harder to get the closely mic'd sound, where you can hear so much incredible detail. I've posted this many times before, but here it is again - the Art Vista software sampled piano - the Virtual Grand Piano: http://www.artvista.net/Virtual_Grand_Piano.html

An attempt to compare two pianos. . . differently mic'ed. . . with different players. . . with a percussive piece of music that doesn't. . . . test the "sustained-note" character of. . . . the instruments.

An attempt to compare two pianos. . . differently mic'ed. . . with different players. . . with a percussive piece of music that doesn't. . . . test the "sustained-note" character of. . . . the instruments.

Why bother ?????

Like the video says, they're "not trying to prove that [their] digital piano is acoustically equivalent to a grand piano" but the "why bother" is obvious, it's a nice marketing piece, and their job is to sell Casios. ;-) Really, though, even within the various limitations, it's kind of interesting to see that, at least in some respects, it might be closer to sounding like a real piano than you'd have expected from a relatively inexpensive DP.

I guess the same test could be done with Yamahas, Kawais, Rolands, and other digital pianos with similar results.

A digital piano is not the same as the recording of an acoustic piano, but produces sound based on different samples that are recordings of an acoustic piano. So, if you record an acoustic piano, it sounds, more or less similar to a digital piano.

But when you are listening to an acoustic piano live, in front of the thing... then is where the difference between digitals and acoustics can be felt in all of its glory (IMHO).

And the piece chosen lacks of long sustained notes (another weak point on digitals) and has lots of short and fast notes. Digitals tend to perform well with the note attacks.

when you are listening to an acoustic piano live, in front of the thing... then is where the difference between digitals and acoustics can be felt in all of its glory (IMHO).

Yes. Even an acoustic piano with great microphones played live in the studio but heard in the control room through top quality studio monitors will not sound the same as hearing the acoustic piano "live" in the room.